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giant shield lichen

Scientific Name: Cetrelia cetrarioides

Family: Parmeliaceae

Category: Lichen

Growth: Lichenous

Duration:

Other Names:

       

Giant Shield Lichen

This page provides information about the Giant Shield Lichen, compiled from various sources to assist gardeners and plant enthusiasts.

Scientific Name and Common Names

  • Scientific Name: Cetrelia monachorum
  • Common Name: Giant Shield Lichen
  • Other common names mentioned: Sea-storm lichen, speckled rag lichen, Chicita's giant shield lichen, Alaskan giant shield lichen

Taxonomy and Nomenclature

  • Kingdom: Plantae (though lichens are not plants but rather symbiotic organisms)
  • Group: Lichen
  • Family: Parmeliaceae
  • Genus: Cetrelia
  • Species: Several species within the genus Cetrelia are mentioned including:
    • Cetrelia monachorum
    • Cetrelia olivetorum (Nyl.) W.L.Culb. & C.F.Culb.
    • Cetrelia alaskana (C. Culb. & Culb.) Culb. & C. Culb.
    • Cetrelia braunsiana
    • Cetrelia chicitae (W.L. Culb.) W.L. Culb. & C.F. Culb.
  • Synonyms:
    • Cetraria chicitae Culb.
    • Cetrelia chicitae (Culb.) Culb. & C. Culb.
    • Parmelia cetrarioides var. rubescens (Th. Fr.) Du Rietz
    • Labeled as Paramelia citrarioides sic, correct spelling: Parmelia cetrarioides.

Morphological Characteristics

  • Visible from a distance as a large pale whitish to greenish-gray form.
  • Features perforate apothecia with large, ellipsoid spores.
  • Has bifusiform conidia.
  • Growth Habit: Lichenous

Distribution and Habitat

  • Primarily an epiphytic lichen.
  • Found on trees in Drummond woods.
  • Ecoregions include northern Quebec dominated by forests of lichen, black and white spruce with feathermoss understory.

Interactions with Other Organisms

  • Often found on the same tree trunks as Green Shield Lichen (Flavoparmelia).

Quirky Facts

  • The text mentions a "Giant Lichen Orbweaver" spider, Araneus bicentenarius, suggesting an interesting association of the lichen's name with other organisms.
  • Giant Lichen Colonies are a feature in the game Spiral Knights, where their dense nature prevents them from being shield-pushed.

Further Information

  • Catalogue of Life: 2012 Annual Checklist
  • Australian Plant Names Index